Plating Specifications and Facts

ASTM B 695-85 For Zinc Coatings

Classes Based On Thickness

Class	Minimum Thickness~um	Minimum Thicknes~inches
110	107	0.0042
80	81	0.0032
70	69	0.0027
65	66	0.0026
55	53	0.0021
50	50	0.002
40	40	0.0016
25	25	0.001
12	12	0.00047
8	8	0.0003
5	5	0.0002

Note: Thickness in um x .0000393 = Thickness in inches.

Type I – without supplementary treatment (no chromate).
Type II – with colored chromate, yellow, bronze, olive drab.

Mechanical Zinc Deposit on Ferrous Substrate
Hours to Failure to White and Red Corrosion

White Corrosion

Class	5	8	12	25	40	50	55-110
Type I	NR	NR	NR	NR	NR	NR	NR
Type II	72	72	72	72	72	72	72

Red Rust

Class	5	8	12	25	40	50	55-110
Type I	36	56	96	192	250	300	NR
Type II	72	72	96	192	250	300	NR

Note: NR = No requirements.